HIM-8はX染色体ペアリングセンターと結合し,染色体特有の中間シナプスを媒介する
Carolyn M Phillips1, Chihunt Wong, Needhi Bhalla
1Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720, USA.
Cell
|December 20, 2005
まとめ
him-8遺伝子は,C.elegans.の半減期中のX染色体のペアリングに不可欠です. him-8機能の喪失は,このプロセスを妨害し,同類染色体安定化におけるその重要な役割を強調する.
科学分野:
- 遺伝学 遺伝学とは
- 分子生物学は分子生物学である.
- 発達生物学 発達生物学とは
背景:
- ミエオシスは,遺伝的多様性のために正確な染色体分離を必要とします.
- C. elegans の him-8 遺伝子は,X染色体分離に不可欠であることが知られている.
- 適切なホモロゲス染色体ペアリングとシナプスは,メオシスの成功に不可欠です.
研究 の 目的:
- C. elegans meiosisにおける him-8遺伝子の機能を調査する.
- HIM-8がX染色体ペアリングとシナプスを促進する分子メカニズムを解明する.
- HIM-8媒介の染色体安定化における核膜結合の役割を決定する.
主な方法:
- C.elegans.におけるヒ-8機能喪失変異体の分析
- ミエオティックプロフェーズ中のHIM-8タンパク質の局所化の特徴.
- ヒム-8変異とミエオティックペアリングセンター (PC) 病変の間の遺伝的相互作用の研究.
- 染色体ペアリング,シナプス,核包の関連性の評価.
主要な成果:
- 彼-8機能の喪失は,X染色体ホモログのペアリングとシナプスの深刻な欠陥につながる.
- HIM-8はC2H2亜鉛指タンパク質で,X染色体上の中性配列センター (PC) に位置しています.
- HIM-8に結合する染色体の部位は,中間プロフェーゼの間に核封筒 (NE) と関連付けられます.
- 染色体結合とNE局所化を保持する him-8変異は,ペアリングを安定させたり,シナプスを促進したりできませんでした.
結論:
- HIM-8は,X染色体ホモログのペアリングとC. elegansのシナプスに不可欠です.
- NE テザリングは必要かもしれませんが,同種の染色体配列の安定化には不十分です.
- メイオティックペアリングの安定化は,HIM-8によって媒介される染色体-NE相互作用以上のアクティブなプロセスです.
関連する概念動画
01:49Meiosis I
Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by a...
01:57Meiosis II
Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each containing...
03:09Meiosis I
Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
02:02Meiosis II
Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
03:09Meiosis I
Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
02:02Meiosis II
Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...